iBored is a tool to view and edit blocks (sectors) of disks and related files (e.g., image files).
I've used it myself to repair iPods that had been borked by installing iPodLinux on them, rescue the most possible data from hard disks with defective sectors, analysed Flash (.flv) files, and much more. It can even access disks remotely over internet.
If you know your bits and bytes, have a look at this tool. It runs on OS X, Windows, and Linux, thanks to it being made with REALbasic.
- Can view disks in custom block sizes.
- When modifying data, a "journal" file is written
- Fixes "View Partitions" to handle APM schemes correctly even if there is no "ER" signature at block 0. This makes it work with TiVo disks.
- Fixes "View Structure" to show entries for a few formerly missing cases (e.g., a FAT vol's root dir).
- OS X 10.6 or later